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For highly lipid soluble drugs like thiopental, the termination of action is primarily due to redistribution from the brain (highly perfused) to less perfused tissues like muscle and fat. Metabolism and excretion are too slow to explain the rapid offset (10 minutes). Plasma protein binding affects distribution but not termination directly.

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Aspirin (salicylate) overdose causes respiratory alkalosis initially (direct stimulation of the respiratory center), followed by metabolic acidosis due to uncoupling of oxidative phosphorylation. Severe poisoning presents with hyperthermia, metabolic acidosis, altered mental status, and coma. Option C describes hypersensitivity-related reactions rather than overdose.

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Carbamazepine is the drug of choice for trigeminal neuralgia (severe stabbing facial pain). It stabilizes hyperexcitable neuronal membranes. Methadone (A) and tramadol (B) are opioids for moderate-severe pain but not first-line for neuralgia. Lorazepam (C) is a benzodiazepine for anxiety.

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Chlorpromazine (Thorazine/Largactil) was the first phenothiazine antipsychotic introduced into clinical practice in the early 1950s. It revolutionized the treatment of schizophrenia and other psychotic disorders. Promazine, Triflupromazine, and Thioridazine were introduced later.

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Insulin glargine is a long-acting basal insulin with a duration of approximately 24 hours. Lispro, Aspart, and Glulisine are rapid-acting insulin analogues with onset in about 15 minutes.